Volume 19, Issue 25 2300571
Research Article

High-Energy-Density Lithium Metal Batteries with Impressive Li+ Transport Dynamic and Wide-Temperature Performance from −60 to 60 °C

Ran Han

Ran Han

School of Materials Science and Engineering, Shanghai University, Shanghai, 200444 China

i-lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou, 215123 China

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Zhicheng Wang

Zhicheng Wang

School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, 230026 China

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Dan Huang

Dan Huang

School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, 230026 China

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Fengrui Zhang

Fengrui Zhang

School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, 230026 China

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Anran Pan

Anran Pan

i-lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou, 215123 China

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Haiqi Song

Haiqi Song

i-lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou, 215123 China

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Yumeng Wei

Yumeng Wei

i-lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou, 215123 China

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Yang Liu

Yang Liu

i-lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou, 215123 China

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Lei Wang

Lei Wang

i-lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou, 215123 China

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Yajie Li

Yajie Li

School of Materials Science and Engineering, Shanghai University, Shanghai, 200444 China

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Jingjing Xu

Corresponding Author

Jingjing Xu

School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, 230026 China

E-mail: [email protected]; [email protected]; [email protected]

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Jianchen Hu

Corresponding Author

Jianchen Hu

National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Research Center of Cooperative Innovation for Functional Organic/Polymer Material Micro/Nanofabrication, Soochow University, Suzhou, 215123 China

E-mail: [email protected]; [email protected]; [email protected]

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Xiaodong Wu

Corresponding Author

Xiaodong Wu

School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, 230026 China

E-mail: [email protected]; [email protected]; [email protected]

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First published: 15 March 2023
Citations: 26

Abstract

High-energy-density Li metal batteries (LMBs) with Nickel (Ni)-rich cathode and Li-metal anode have attracted extensive attention in recent years. However, commercial carbonate electrolytes bring severe challenges including poor cycling stability, severe Li dendrite growth and cathode cracks, and narrow operating temperature window, especially hardly work at below −40 °C. In this work, a 2.4 m lithium difluoro(oxalato)borate (LiDFOB) in ethyl acetate (EA) solvent with 20 wt% fluorocarbonate (FEC) (named 2.4m-DEF) is designed to solve Li+ transport dynamic at low temperature and improve interfacial stability between electrolyte with Li anode or Ni-rich cathode. Beneficial lower freezing point, lower viscosity, and higher dielectric constant of EA solvent, the electrolyte exhibits excellent Li+ transport dynamic. Relying on the unique Li+ solvation structure, more DFOB anions and FEC solvents are decomposed to establish a stable solid electrolyte interface at electrolyte/electrode. Therefore, LiNi0.9Co0.05Mn0.05O2 (NCM90)/Li LMB with 2.4m-DEF enables excellent rate capability (184 mA h g−1 at 30 C) and stable cycling performance with ≈93.7% of capacity retention after 200 cycles at 20 C and room temperature. Moreover, the NCM90/Li LMB with 2.4m-DEF exhibits surprising ultra-low-temperature performance, showing 173 mA h g−1 at −40 °C and 152 mA h g−1 at −60 °C, respectively.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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